Automatic typewriting marginator



Feb-11, 1936.

T. PIMENTEL 2,030,395

AUTOMATIC TYPEWRITING MARGINATOR Fil e d. Feb.. 4, 1935 ziPzmenez Gttorneg Zinnentor 1; moved.

Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE ApTOMATIC TYPEWRITING MARGINATOR Thomas Pimentel, Campinas, Brazil Application February 4. 1935, Serial No. 4,946 In Brazil February 26, 1934 3 Claims. (01. 197-141) This invention relates. to an automatic typewriting marginator for margining the papersemployed on a typewriting machine so as to provide a constant and even margin at the bottom of the 5 sheet of paper.

The invention will be better understood when described in connection with the accompanying drawing in which:

Figure 1 is a top plan view of my invention.

1 Figure 2 is a front elevational view.

Figure 3 is an end elevational view ofthe apparatus.

Figure 4 is a sectional view of part of the apparatus as shown in Figure 3, the platen re- Figure 5 is a. top plan view of the apparatus shown in greater detail than in Figure 1.

Figure 6 is a bottom plan view of the apparatus as shown in Figure 5. Figures '7 and 7a are plan and elevational views respectively, of the threaded end of the typewriter'platen.

Figures 8 and 8a are top and side views respectively of a detail showing the relative dimensions of the parts'illustrated.

Figures 9 and 10 are, respectively, side'and top views of the pawl, and

Figure 11 is ayiew of a lever.

The mechanism is made of a metallic or other resistant and suitable material and is constructed in two parts, which in this specification are'called the cylinder and the pawl mounting.

The cylinder is formed with an outer diameter equal to the outer diameter of the platen of the typewriter, which isv usually coated with a layer of hard rubber and of an inner diameter equal to the outer diameter of the platen with the rubber layer removed so that the cylinder may be fitted on the end of the platen as, a sleeve. In order to place the cylinder on the platen, a part of the rubber is removed from the platen so that the cylinder and platen will constitute a single unit when assembled.

The surface of the cylinder is screw threaded at a and a hole c is provided at the end of this thread, which hole extends through the thickness of the cylinder and into the platen so that an easy adjustment of the cylinder to the same position on the platen is obtained. The' pawl mounting is composed of a metallic piece which, however, may be constructed of any other suitable material on which there is mounted a pawl d. The mounting which is designated at g is connected by means of screws to the paper carrying plate of the carriage of the typewriter. In case there is no such plate it is necessary to fix the mounting directly on the rear. frame of the carriage.

When the pawl mounting is fixed to the carriage the point of the pawl d rests in the thread 5 a of the cylinder. It may be removed, however, if the pawl is lifted by hand or if the small lever f is operated. r I

The pawl is mounted by a fiat steel springd which serves to maintain a downward pressure 10 on the pawl d. The spring d forces the pawl into the hole 0 when the platen is rotated.

Since the paper may be of difierent sizes, the spiral may be made with as many threads as are necessary for thedifierent sizes of paper. On the 15 rubber platen there is provided a horizontal paper adjusting line b which line allows the prompt adjustment of the horizontal position of the paper so that once the paper is adjusted at its upper border to theadjusting line the same 0 lower margin will be obtained in all cases. It is to be understood that other adjusting lines may be provided according to the various sizes of the paper to be used in the typewriter.

The operation of the apparatus takes place in 25 the following manner:

When theplaten is rotated the pawl d which rests in the thread a, will slide around this thread or spiral groove until it reaches the hole c which is the'terminal point of the groove, when it will 30 drop into the same under the force of the spring d and will prevent further rotation of the platen. The pawl d is held by the spring d in the groove of the spiral. Whenthe paper is introduced one should rest the point of the pawl in 35 the right-hand thread (see Fig. 2) after which the paper must be adjusted to the horizontal line 1). Once the machine is put--in motion, one writes without any preoccupation concerning the lower margin. When the line spacer is operated, 40

the pawl slides from right to left around the spiral groove until it reaches the hole 0. Once the point of the pawl is inserted therein the -platen will not turn any farther. After the per has been removed by operating the paper 45 is lowered by pulling it forwards, the marginator will be immediately set in operation as described above.

What I claim is:

1. A foot margin regulator for typewriters having platens comprising a cylinder mounted on one end oi? the platen, said cylinder being provided with a spiral groove and a recess in one end thereof, a pawl pivotally mounted on the type- I writer, slidably engageable in said groove and adapted to drop into said recess, a spring associated with said pawl tending to keep said pawl in engagement with said groove whereby the platen after successive turns is stopped when the pawl engages said recess.

2. A toot margin regulator for typewriters having platens comprising a cylinder mounted on one end or the platen, said cylinder being provided with a spiral groove and a recess in one end thereof, a spring lever pivoted at one end to the 3. A foot margin regulator for typewriters having platens comprising a cylinder mounted on one end of the platen, said cylinder being provided with a spiral groove and a recess in one end thereof, a pawl pivotally mounted on the typewriter, slidably engageable in said groove and adapted to drop into said recess, a spring associated with said pawl tending to keep said pawl in engagement with said groove whereby the platen after successive turns is stopped when the pawl engages said recess, and means for retaining said pawl from engagement with said groove.

THOMAS PIMEN'I'EL. 

